如何像docker-compose一样部署多服务应用，这一节我们先看手动的方式 本节课所用的源码文件 https://github.com/xiaopeng163/flask-redis 创建一个mynet的overlay网络 
    1. vagrant@swarm-manager:~$ docker network ls
    2. NETWORK ID     NAME              DRIVER    SCOPE
    3. afc8f54c1d07   bridge            bridge    local
    4. 128fd1cb0fae   docker_gwbridge   bridge    local
    5. 0ea68b0d28b9   host              host      local
    6. 14fy2l7a4mci   ingress           overlay   swarm
    7. lpirdge00y3j   mynet             overlay   swarm
    8. a8edf1804fb6   none              null      local
    9. vagrant@swarm-manager:~$
    创建一个redis的service 
    1. vagrant@swarm-manager:~$ docker service create --network mynet --name redis redis:latest redis-server --requirepass ABC123
    2. qh3nfeth3wc7uoz9ozvzta5ea
    3. overall progress: 1 out of 1 tasks
    4. 1/1: running   [==================================================>]
    5. verify: Service converged
    6. vagrant@swarm-manager:~$ docker servce ls
    7. docker: 'servce' is not a docker command.
    8. See 'docker --help'
    9. vagrant@swarm-manager:~$ docker service ls
    10. ID             NAME      MODE         REPLICAS   IMAGE          PORTS
    11. qh3nfeth3wc7   redis     replicated   1/1        redis:latest
    12. vagrant@swarm-manager:~$ docker service ps redis
    13. ID             NAME      IMAGE          NODE            DESIRED STATE   CURRENT STATE            ERROR     PORTS
    14. 111cpkjn4a0k   redis.1   redis:latest   swarm-worker2   Running         Running 19 seconds ago
    15. vagrant@swarm-manager:~$
    创建一个flask的service 
    1. vagrant@swarm-manager:~$ docker service create --network mynet --name flask --env REDIS_HOST=redis --env REDIS_PASS=ABC123 -p 8080:5000 xiaopeng163/flask-redis:latest
    2. y7garhvlxah592j5lmqv8a3xj
    3. overall progress: 1 out of 1 tasks
    4. 1/1: running   [==================================================>]
    5. verify: Service converged
    6. vagrant@swarm-manager:~$ docker service ls
    7. ID             NAME      MODE         REPLICAS   IMAGE                            PORTS
    8. y7garhvlxah5   flask     replicated   1/1        xiaopeng163/flask-redis:latest   *:8080->5000/tcp
    9. qh3nfeth3wc7   redis     replicated   1/1        redis:latest
    10. vagrant@swarm-manager:~$ docker service ps flask
    11. ID             NAME      IMAGE                            NODE            DESIRED STATE   CURRENT STATE            ERROR     PORTS
    12. quptcq7vb48w   flask.1   xiaopeng163/flask-redis:latest   swarm-worker1   Running         Running 15 seconds ago
    13. vagrant@swarm-manager:~$ curl 127.0.0.1:8080
    14. Hello Container World! I have been seen 1 times and my hostname is d4de54036614.
    15. vagrant@swarm-manager:~$ curl 127.0.0.1:8080
    16. Hello Container World! I have been seen 2 times and my hostname is d4de54036614.
    17. vagrant@swarm-manager:~$ curl 127.0.0.1:8080
    18. Hello Container World! I have been seen 3 times and my hostname is d4de54036614.
    19. vagrant@swarm-manager:~$ curl 127.0.0.1:8080
    20. Hello Container World! I have been seen 4 times and my hostname is d4de54036614.
    21. vagrant@swarm-manager:~$